Bidirectional Time Adjustment for Wireless Uplink Alignment
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Solution Overview
Problem
Propagation delay between a base station and communication devices causes misalignment of uplink and downlink messages, leading to interference and alignment issues, especially at large distances, due to the finite speed of message transmission and varying distances between devices.
Innovation Solution
A communication apparatus with time adjustment decoding and application circuitry that applies both positive and negative time adjustments to uplink messages to align them with reference boundaries, selected based on propagation delay ranges, allowing for smaller magnitude adjustments and overcoming hardware and format limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only positive time adjustments are applied to advance uplink messages, then alignment with reference boundaries is achieved for small to medium distances, but the system cannot handle large propagation delays beyond hardware capability limits
Solution Approach 1:
The patent applies negative time adjustments (delaying uplink messages) in addition to positive time adjustments (advancing messages). This inversion of the conventional approach allows the system to handle large propagation delays by retarding messages when the calculated advance exceeds hardware capability thresholds, thereby extending adaptability to large distances while maintaining alignment precision through bidirectional adjustment capability
Solution Approach 2:
The system dynamically changes the time adjustment parameter from exclusively positive values to both positive and negative values based on propagation delay magnitude and hardware capability thresholds. This parameter change enables the system to adapt to varying distances by selecting appropriate adjustment directions and magnitudes, resolving the contradiction between precision and adaptability
2Reliability
If large positive time adjustments are applied to compensate for large propagation delays, then long-range communication alignment is improved, but hardware capability limits and message format constraints are exceeded
Solution Approach 1:
The patent applies partial time adjustments by introducing threshold checks that limit the magnitude of positive time adjustments to hardware capability thresholds. When propagation delay compensation exceeds these thresholds, the system switches to negative time adjustments or alternative strategies, thereby maintaining communication reliability without exceeding hardware or format constraints
Solution Approach 2:
The system introduces threshold values as intermediary parameters that mediate between propagation delay requirements and hardware capabilities. These thresholds act as intermediaries to determine whether to apply positive or negative time adjustments, simplifying the overall system by providing clear decision boundaries rather than requiring complex continuous optimization
3Ease of manufacture
If time adjustments are limited to a finite range of values, then hardware implementation and message format simplicity are improved, but the ability to compensate for arbitrary propagation delays is reduced
Solution Approach 1:
The patent makes the time adjustment dynamic by allowing transitions between positive and negative adjustments based on real-time propagation delay measurements and threshold comparisons. This dynamic approach enables the system to maintain alignment precision within finite value ranges by adaptively selecting the appropriate adjustment direction and magnitude, thereby achieving both implementation ease and precision
Data Source
AI summary
A communication apparatus comprises antenna circuitry configured to, during a communication session, transmit uplink messages to a base station and receive downlink messages from the base station. The apparatus also comprises time adjustment decoding circuitry to decode a time adjustment from a message received from the base station, and time adjustment application circuitry to apply the time adjustment to the uplink messages. The time adjustment application circuitry is capable of applying both of a positive time adjustment to advance a given uplink message and a negative time adjustment to retard the given uplink message.